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# A fair coin with sides marked heads and tails is to be

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Joined: 03 Apr 2006
Posts: 46
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Kudos [?]: 7 [0], given: 0

A fair coin with sides marked heads and tails is to be [#permalink]  09 Jun 2007, 15:33
A fair coin with sides marked heads and tails is to be tossed eight times. What is the probability that the coin will land tails side up more than five times?

a) 37/256
b) 45/256
c)23/256
d) 70/ 256
e) 81/ 256
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Joined: 13 Mar 2007
Posts: 545
Schools: MIT Sloan
Followers: 4

Kudos [?]: 28 [0], given: 0

(A)

t>5

i.e t = 6 or 7 or 8

prob(t=6) = 8C6 (1/2)^8

prob(t=7) = 8C7 (1/2)^8

prob(t=8) = 1

= 37/256
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